Compass



st. 2, 1956 F. DE CESARIS {764,816

COMPASS Filed Dec. 10. 1952 INVENTOR.

F r e d DeCesuri's aw srwaim ATTOR N EY United States Patent COMPASSFredDe Cesaris, Johnston, R. I.

Application December 10, 1952,. No. 325,383

' 1 Claim. (CI. 33-27) This invention relates to a compass and moreparticularly to that part of the compass leg which holds a lead pencil,crayon, chalk or other marking medium.

One of the objects of the present invention is to provide a holder on acompass leg which will accommodate lead pencils, crayons, chalk and thelike, having widely varying diameters and shapes.

Another object of the present invention is to provide a sturdy, neat,inexpensive, foolproof, positive acting holder for a compass.

The invention contemplates a construction of the pencil holding deviceinvolving a simply constructed hinge having one part of the hingesecured to or forming an integral part of the compass leg and a camarrangement operably connecting the front part of the hinges to clamp orsqueeze' the pencil, chalk, crayon or other marking medium, in positionwith relation to the other leg of the compass.

Other objects of the present invention will be pointed out in part andbecome apparent in part in the following specification and claim.

Referring to the drawings in which similar characters of referenceindicate corresponding parts in all the figures:

Figure l is a side elevational view of a compass embodying the new andnovel pencil holder.

Figure 2 is a sectional view taken along line 2-2 of Figure 1.

Figure 3 is a side elevational view of a modified form of cam operatingthe hinge of the new pencil holder.

Figure 4 is an end view taken along line 44 of Figure 3.

Figure 5 is a perspective view of still another modified form of camcontrol of the hinge forming in part the new, novel and useful pencilholder.

Figure 6 is a side elevational view of another modified form of camcontrolling the hinge of the new pencil holder.

Figure 7 is a sectional view taken along line 7-7 of Figure 6.

Figure 8 is a plan view of a detail part embodied in the form shown inFigure 6.

Figure 9 is a rear elevational view of the holder shown in Figure 1.

Referring to Figures 1 and 2 wherein is illustrated a compass 9comprising a pair of legs 10, 11 pivotally connected by a pintle 12 attheir upper ends. A handle 13 is connected with a short plate 14disposed between the upper ends of the legs and associated with amechanism for holding the handle on the central line between the legs inall possible positions of the legs. More particularly, a ball 15 isslidably mounted through crossed slots 16 and 17 formed in short plate14 and leg 11 respectively, and through a slot in leg 10. This type ofconstruction is generally known and for this reason the descriptionthereof will not be amplified in this specification.

An arcuate bar 19 projects from leg 10, and extends past the other leg11. This arcuate bar is calibrated with 2,764,816 b atentecl. Oct. 2,1956.

"ice j 2 a scale 20 adapted to show the angle to which the compass isopened. A. finger 21 projects from leg 11- and indicates upon the scale20.

A. feature of this invention is a novel construction for holding; apencil 22 adjustably' mounted on one of the legs of the compass. Theholder comprises a segmental member or plate 23 having asemi-cylindrical body portion provided with two ears 24, 24A. One sideof' the segment or plate 23 is provided with an outwardly projectingninety degree flange having a; tapered or cam edge 25 and a flat face26. A second segmental member or plate 27 having a semi-cylindrical bodyportion isprovided with two slots 7 and 8. adapted: to receive ears 24,24A andbe pivotally mounted thereby. One side: of thesegment or plate 27is provided with an outwardly projecting ninety degree flange having atapered or cam edge 28 and a flat face 29. Cam edges 25 and 28 terminatein stops 30, 31 and 32, 33 respectively. A cam follower or clampingplate 34 having opposite edges bent at ninety degrees forming a track tocontact cam edges 25 and 28 is slidably mounted on faces 26, 29 whichare coplanar.

Segmental or plate member 23 is either formed as an integral part of leg10 or it is fixed to leg 10 as by soldering, brazing or welding, asshown in Figure 2.

Cam edges 25 and 28 as seen in Figure l taper upward. When a pencil ofany shape, or crayon, chalk or the like, is inserted between segmentalmembers or plates having semi-cylindrical body portions 23 and 27 itwill pivot those members about each other. Cam follower 34 will forcecam edges 25' and 28 together causing segmental members orsemi-cylindrical body portions 23, 27 to grip the pencil, crayon or thelike. Thus an easily operated, inexpensively made, foolproof, positiveacting holder is provided on the leg of a compass. The pencil or chalkcan be gripped with a force easily felt and easily determined by theuser manipulating cam follower 34, saving breakage of the markingmedium. The taper of cam edges 25 and 28 can be great or small and thecorresponding width of cam follower 34 provided to permit segmentalmembers 23 and 27 to accommodate very thick and very thin diameters ofmarking material in a range not now possible.

Figures 3 and 4 show segmental members or plates having semi-cylindricalbody portions 23 and 27, cam edge 25A, faces 26, 29 and cam follower 34Awhich takes the form of lever pivotally mounted at 35 in face 29 andhaving a contact disk 36 engaging cam edge 25A. Leg 10 is fixed tosegmental member or plate 27 or it forms an integral part thereof.

Figure 5 shows a modified form of cam edge 25B which permits lever 34Ato control the opening; and closing of the hinge comprising segmentalmembers; 23 and 27 because cam 25B is always under control of contactdisk 36.

Figures 6, 7 and 8 show still another modified form of hinge control.Segmental members 23 and 27 are pivotally connected as in the previousfigures through ears 24, 24A in segmental member 23 and slots 7, 8 insegmental member 27 which is united with leg 10. Faces 26, 29 and alever 34B are provided with the modification of two pins 40, 41 rivetedin faces 26, 29 respectively. Lever 34B is integrally formed with a disk44.1 Two cam slots 42, 43 are provided in disk 44 which engage pins 40,41 respectively. The edges of cam slots 42, 43 are the cams. Pins 40, 41are the cam followers. Slot 43 is concentric With the center of the disk44. Slot 42 is eccentric with respect to the center of disk 44. Itbecomes obvious to those skilled in the art, that as slot 43 ridesaround pin 41, slot 42 will move pin 40 toward and away from the centerof disk 44. Hence face 26 and segmental member 23 will be caused to movein relation to segmental member 27 to increase or decrease the areabetween segmental members 23 and 27. A cap 45 to cover disk 44 andpresent an aesthetically pleasing appearance is provided with two ears46 and 47 which fit into a recess 48 in the edge of disk 44 and a slot50 in disk 44 respectively and are bent to embrace faces 26, 29 andthereby secure cap 45 and cam follower 34B'including disk 44 and faces26, 29 together as a pivotal working unit.

Having shown and described preferred embodiments of the presentinvention, by way of example, it should be realized that structuralchanges could be made and other examples given without departing fromeither the spirit or scope of this invention.

What I claim is:

In a drafting compass having two separate legs pivotally connected, apencil holder comprising two similar oppositely placed plates havingsemi-cylindrical body portions, one edge of one plate having ears formedthereon, one edge of the opposite plate having slots pivotally engagingsaid ears, opposite edges of both plates having outwardly projectingflanges with tapered edges and coplanar flat faces, a wedge shapedclamping plate having References Cited in the file of this patent UNITEDSTATES PATENTS 130,038 Hagerty July 30, 1872 319,591 Magee June 9, 1885632,858 Waibel Sept. 12, 1899 1,461,421 Hood July 10, 1923 2,080,917Hochman May 18, 1937 2,596,133 Donahue et a1 May 13, 1952

